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Finding the Third Proportional to 11,520 and 16,920

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Solution

The third proportional to 11,520 and 16,920 is: 24,851.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,520 : 16,920 = 16,920 : x
  2. Step 2: Convert to fraction form
    11,520/16,920 = 16,920/x
  3. Step 3: Cross multiply
    11,520x = 16,920 × 16,920
  4. Step 4: Simplify right side
    11,520x = 286,286,400
  5. Step 5: Solve for x
    x = 286,286,400/11,520
  6. Step 6: Final answer
    x = 24,851.25

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.